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(parent: 269b050) | patch
KVM: x86: BSF and BSR emulation change register unnecassarily
authorNadav Amit <namit@cs.technion.ac.il>
Mon, 30 Mar 2015 12:39:21 +0000 (15:39 +0300)
committerPaolo Bonzini <pbonzini@redhat.com>
Mon, 30 Mar 2015 14:46:11 +0000 (16:46 +0200)
commit01fe5a57c456837f9a404e684738994f0d4e9bad
tree88322796917be9a8edc1b43adb7f0d932e8acea8tree | snapshot
parent269b050fafdd3732dd4ff57d0ca975269cc55238commit | diff
KVM: x86: BSF and BSR emulation change register unnecassarily

If the source of BSF and BSR is zero, the destination register should not
change. That is how real hardware behaves.  If we set the destination even with
the same value that we had before, we may clear bits [63:32] unnecassarily.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Message-Id: <1427719163-5429-4-git-send-email-namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/emulate.c diff | blob | history
Linux Kernel Source Tree.